Blackberry Question

I realize this is not an electronic's discussion board, but as international professionals, I figured many people on here would know. If I get a Blackberry here in the U.S., can I travel to say Europe or Asia, buy a pay-as-you-go sim card there, and just pop it in my Blackberry to use while I am there? How about with a Treo? Can I do that? I can't seem to find the info. on the internet (guess I am not really sure how to search for it). Also, what do you prefer: Blackberry or Treo?

I realize this is not an electronic's discussion board, but as international professionals, I figured many people on here would know. If I get a Blackberry here in the U.S., can I travel to say Europe or Asia, buy a pay-as-you-go sim card there, and just pop it in my Blackberry to use while I am there? How about with a Treo? Can I do that?

I can't seem to find the info. on the internet (guess I am not really sure how to search for it).

Also, what do you prefer: Blackberry or Treo?

Not sure regarding the Blackberry issue, but have you considered SYmbian? EIther Series 80 or even Series 60? The largest percentage of smartphones worldwide run that OS which would make your life considerable easier. But I am biased as I own a Nokia 6630 which runs Series 60...
Anyway, the whole issue with the Blackberry will centre around three things:

Hmm, thanks for the advice; the only problem is I only have a choice between Blackberry and Treo (it is a company phone)

Ok, then find out first of all what network it needs to use, GSM, CDMA,TDMA et.c. Or if you find the exact model you may be able to work it out. The most options would be with quad-band GSM. 3G would be nice, EDGE, et.c. but not necessary. In Japan and Korea, networks are different, in the USA you find everything pretty much, including different varieties on the same general GSM band (850 vs 900) as well as older standards like CDMA et al. Here is an excellent resource on GSM bands used internationally: http://www.gsmworld.com/roaming/gsminfo/index.shtml

Well, I know that with T-Mobile, the new Blackberry 8700 will work in most every country; it tells you how it will work in each country/rates, etc. The problem is though, that it is a work phone, but sometimes I go on personal vacation to Japan/Ireland mostly and I am not going to charge it to my company account, so I would like to buy a prepaid simcard while I am there. That is why I am curious to know if I can just put it in my phone, whether it will work or not?

Maybe it is a stupid or obvious question, or you might have already answered it, but unfortunately, I don't know crap about phones......

Well, I know that with T-Mobile, the new Blackberry 8700 will work in most every country; it tells you how it will work in each country/rates, etc. The problem is though, that it is a work phone, but sometimes I go on personal vacation to Japan/Ireland mostly and I am not going to charge it to my company account, so I would like to buy a prepaid simcard while I am there. That is why I am curious to know if I can just put it in my phone, whether it will work or not?

Maybe it is a stupid or obvious question, or you might have already answered it, but unfortunately, I don't know crap about phones......

Just get it unlocked.Must be a way, either through T-Mobile or with 3rd party software. You could call them and tell them you are going overseas where there is no T-mo coverage and wouldlike to get it unlocked to use a different SIM. They unlocked my Ericsson T310 for me when I first got T-Mo. If not there are probably softs that will do that for you. Unless your Blackberry is NOT tied to T-Mobile. Then you would be ok.